In one of evenings 1790 the professor of medicine of Bodensky university Galvani studied nervous system of frogs in laboratory. One of assistants has casually touched a nerve of a frog a scalpel and has seen, how pads of the dead frog lying on some, distance from the electric car have shuddered. Other assistant has noticed that this phenomenon occurred only at the moment of occurrence of a spark from the electric car.
Amazed with the new phenomenon, I have immediately paid to it the attention though planned during this moment absolutely other and have been entirely absorbed by the thoughts, - wrote subsequently Galvani - I was captured by extreme thirst and eagerness to investigate it and to throw light that under it has been hidden.

The experiences of Galvani has described in 1791 in the well-known Treatise about forces of an electricity at muscular movement. The observant experimenter has not escaped that movements of a pad of a frog are caused by occurrence in its nervously-muscular fabric of short-term electric currents. At first Galvani has assumed that occurrence of this current is caused by an atmospheric electricity. The further experiences have convinced the scientist that the electricity is in an animal. So in the physicist there was a doctrine about an animal electricity.